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STOCK PLANS (Details 2) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Share-Based Compensation |  |  |
Stock-based compensation expense | $ 31,725 | $ 31,601 | $ 31,248
Compensation expense from stock options, employees | 21,980 | 24,056 | 24,505
Compensation expense from stock options, non-employee awards | 663 | 167 | 841
Restricted Stock or Unit Expense | 8,371 | 6,698 | 5,117
Compensation expense from employee stock purchase plan | 711 | 680 | 785
Stock-based compensation | 31,725 | 31,601 | 31,248
Cost of revenues |  |  |
Share-Based Compensation |  |  |
Stock-based compensation expense | 4,478 | 5,467 | 6,438
Research and development |  |  |
Share-Based Compensation |  |  |
Stock-based compensation expense | 3,934 | 3,341 | 3,297
Selling, general and administrative |  |  |
Share-Based Compensation |  |  |
Stock-based compensation expense | $ 23,313 | $ 22,793 | $ 21,513

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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